修改了getRdbStore 和 deleteRdbStore 例程

Signed-off-by: NPaDoBoo <xuejianwu@huawei.com>

zh-cn/application-dev/reference/apis/js-apis-data-rdb.md

@@ -32,12 +32,16 @@ getRdbStore(context: Context, config: StoreConfig, version: number, callback: As
 
 - 示例：
   ```
+  import Ability from '@ohos.application.Ability'
+  import data_rdb from '@ohos.data.rdb'
+  export default class MainAbility extends Ability {
       const STORE_CONFIG = { name: "RdbTest.db"}
       const SQL_CREATE_TABLE = "CREATE TABLE IF NOT EXISTS EMPLOYEE (ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT NOT NULL, AGE INTEGER, SALARY REAL, CODES BLOB)"
       data_rdb.getRdbStore(this.context, STORE_CONFIG, 1, function (err, rdbStore) {
           rdbStore.executeSql(SQL_CREATE_TABLE)
           console.info(TAG + 'create table done.')
       })
+  }
   ```
 
 ## data_rdb.getRdbStore
@@ -60,6 +64,9 @@ getRdbStore(context: Context, config: StoreConfig, version: number): Promise<
 
 - 示例：
   ```
+  import Ability from '@ohos.application.Ability'
+  import data_rdb from '@ohos.data.rdb'
+  export default class MainAbility extends Ability {
       const STORE_CONFIG = { name: "RdbTest.db" }
       const SQL_CREATE_TABLE = "CREATE TABLE IF NOT EXISTS EMPLOYEE (ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT NOT NULL, AGE INTEGER, SALARY REAL, CODES BLOB)"
       let promise = data_rdb.getRdbStore(this.context, STORE_CONFIG, 1);
@@ -68,6 +75,7 @@ getRdbStore(context: Context, config: StoreConfig, version: number): Promise<
       }).catch((err) => {
           expect(null).assertFail();
       })
+  }
   ```
 
 ## data_rdb.deleteRdbStore
@@ -85,8 +93,12 @@ deleteRdbStore(context: Context, name: string, callback: AsyncCallback<void&g
 
 - 示例：
   ```
+  import Ability from '@ohos.application.Ability'
+  import data_rdb from '@ohos.data.rdb'
+  export default class MainAbility extends Ability {
       data_rdb.deleteRdbStore(this.context, "RdbTest.db", function (err, rdbStore) {
           console.info(TAG + 'delete store done.')})
+  }
   ```
 
 ## data_rdb.deleteRdbStore
@@ -108,10 +120,14 @@ deleteRdbStore(context: Context, name: string): Promise<void>
 
 - 示例：
   ```
+  import Ability from '@ohos.application.Ability'
+  import data_rdb from '@ohos.data.rdb'
+  export default class MainAbility extends Ability {
       let promise = data_rdb.deleteRdbStore(this.context, "RdbTest.db")
       promise.then(()=>{
           console.info(TAG + 'delete store done.')
       })
+  }
   ```
 
 ## RdbPredicates